Revision 0:f8e8cccfd476, committed 2015-10-11

Comitter:

stumpi

Date:

Sun Oct 11 18:40:27 2015 +0000

Commit message:

First init

Changed in this revision

diff -r 000000000000 -r f8e8cccfd476 MCP9808.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MCP9808.cpp	Sun Oct 11 18:40:27 2015 +0000
@@ -0,0 +1,41 @@
+#include "MCP9808.h"
+
+MCP9808::MCP9808(PinName sda, PinName scl) : i2c(sda, scl)
+    {
+    } 
+     
+// read temperature from MCP9808    
+float MCP9808::readTemp()
+    {
+        data_write[0] = MCP9808_REG_TEMP;
+        i2c.write(MCP9808_ADDR, data_write, 1, 1); // no stop
+        i2c.read(MCP9808_ADDR, data_read, 2, 0);
+ 
+        if(data_read[0] & 0xE0) {
+            data_read[0] = data_read[0] & 0x1F;  // clear flag bits
+        }
+        if((data_read[0] & 0x10) == 0x10) { // < 0 C
+            data_read[0] = data_read[0] & 0x0F;
+            tempval = 256 - (data_read[0] * 16) + (data_read[1] / 16.0);
+            tempval = tempval * -1;
+        } else { // > 0 C
+            tempval = (data_read[0] * 16) + (data_read[1] / 16.0);
+        }
+        return tempval;
+        }  
+
+void MCP9808::goSleep()
+{
+    data_write[0] = MCP9808_REG_CONF;
+    data_write[1] = 0x01;  // config msb
+    data_write[2] = 0x00;  // config lsb
+    int status = i2c.write(MCP9808_ADDR, data_write, 3, 0);    
+    }
+    
+void MCP9808::wakeUp()
+{
+    data_write[0] = MCP9808_REG_CONF;
+    data_write[1] = 0x00;  // config msb
+    data_write[2] = 0x00;  // config lsb
+    int status = i2c.write(MCP9808_ADDR, data_write, 3, 0);    
+    }
\ No newline at end of file

diff -r 000000000000 -r f8e8cccfd476 MCP9808.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MCP9808.h	Sun Oct 11 18:40:27 2015 +0000
@@ -0,0 +1,51 @@
+/** mbded library for driving the MCP9808 Temperature sensor
+* datasheet link : http://ww1.microchip.com/downloads/en/DeviceDoc/25095A.pdf
+* breakout       : Adafruit MCP9808 Breakout board
+* Christoph Suter (code based on Richard Kadrmas Nucleo-MCP9808 sample)
+*/
+
+
+#include "mbed.h"
+
+
+#ifndef MBED_DS3231_H
+#define MBED_DS3231_H
+//MCP9808 8 bit adress
+#define MCP9808_ADDR     (0x30) // MCP9808 base address 0x18<<1
+
+#define MCP9808_REG_TEMP (0x05) // Temperature Register
+#define MCP9808_REG_CONF (0x01) // Configuration Register
+
+/* Interface to MAXIM DS3231 RTC */
+class MCP9808
+    {public :
+     /** Create an instance of the MCP9808 connected to specfied I2C pins
+     *
+     * @param sda The I2C data pin
+     * @param scl The I2C clock pin
+     */
+     MCP9808(PinName sda, PinName scl);
+     
+     /** Read the temperature
+     *
+     * @return The temperature
+     */
+     float readTemp();
+     
+     /** Go to sleep
+     */
+     void goSleep();
+     
+     /** Wake up
+     */
+     void wakeUp();
+     
+     
+     private :
+     I2C i2c;
+     char data_write[3];
+     char data_read[2];
+     float tempval;
+     };
+     
+#endif
\ No newline at end of file